What is all about?
We need to create an xslt file, which will perform the following acts. The whole story is about legislation. Think about what's going on with legislative modifications. You have an old law X and legislator bring a new law Y, which has modifications referring to law X. A modification can replace any kind of subpart of a law (section, article, paragraph etc).
Law X
Article 1
- SOMETHING REALLY OLD HERE
- blah blah blah
Article 2 [....]
Law Y
Article 1
- blahblahblah
Article 2
- Replace the 1st paragraph of the 1st article in Law Y as: "SOMETHING FRESH AND AWESOME".
And what you really want to know?
Law X'
Article 1
- SOMETHING FRESH AND AWESOME
- blah blah blah
Article 2 [....]
Let's move to XML legislative world
We have XML file X like this
<Legislation DocumentURI="X">
<Metadata>[...]</Metadata>
<Introduction>[...]</Introduction>
<Body>
<Article DocumentURI="X/article/1">
<P DocumentURI="X/article/1/paragraph/1">
<P2 DocumentURI="X/article/1/paragraph/1/passage/1">
<Text>SOMETHING REALLY OLD HERE</Text>
</P2>
</P>
<P DocumentURI="X/article/1/paragraph/2">
<P2 DocumentURI="X/article/1/paragraph/2/passage/1">
<Text>blahblahblah</Text>
</P2>
</P>
</Article>
</Body>
</Legislation>
We have XML file Y like this
<Legislation DocumentURI="Y">
<Metadata>[...]</Metadata>
<Introduction>[...]</Introduction>
<Body>
<Article DocumentURI="Y/article/1">
<P DocumentURI="Y/article/1/paragraph/1">
<P2 DocumentURI="Y/article/1/paragraph/1/passage/1">
<Text>blahblahblah</Text>
</P2>
</P>
</Article>
<Article DocumentURI="Y/article/2">
<P DocumentURI="Y/article/2/paragraph/1">
<P2 DocumentURI="Y/article/2/paragraph/1/passage/1">
<Text>Replace the 1st paragraph of the 1st article in Law Y as:</Text>
</P2>
<Modification DocumentURI="Y/modification/1">
<P2 URI="X/article/1/paragraph/1/passage/1">
<Text>SOMETHING FRESH ANS AWESOME</Text>
</P2>
</Modification>
</P>
</Article>
</Body>
</Legislation>
And we'll produce X':
<Legislation DocumentURI="X">
<Metadata>[...]</Metadata>
<Introduction>[...]</Introduction>
<Body>
<Article DocumentURI="X/article/1">
<P DocumentURI="X/article/1/paragraph/1">
<P2 DocumentURI="X/article/1/paragraph/1/passage/1">
<Text>SOMETHING FRESH AND AWESOME</Text>
</P2>
</P>
<P DocumentURI="X/article/1/paragraph/2">
<P2 DocumentURI="X/article/1/paragraph/2/passage/1">
<Text>blahblahblah</Text>
</P2>
</P>
</Article>
</Body>
</Legislation>
TIP: <Modification> content can be any kind of subpart of law. Maybe a single XML element like this above, maybe a whole nested node like a whole article!
TIP2: Who told you that <Modification> to the same element occurs only once? Maybe in 2012 a law Y modifies a specific part, and then in 2013 a new law Z modifies the already modified part in a different way or a subpart of this part!
TIP3: Who told you that <Modification> refers to an element, which is already in file X? Maybe a law Y add a new part in the old law X!
How we know where are the modifications?
- We know their DocumentURI attribute values.
- We know the XML files, in which they are standing.
Before using XSLT, an action (findmodifications) is called. The action uses wildcard (*) from URL, which represents law's id, and search in a rdfstore for modifications. In the end we set a request parameter called modifications, to return results.
The modifications' parameter has the following structure:
modification[0][0] = PD201210.xml
modification[0][1] = http://localhost:8888/GRLegislation/pd/2012/10/modification/1
modification[1][0] = PD201210.xml
modification[1][1] = http://localhost:8888/GRLegislation/pd/2012/10/modification/2
.
.
.
And after all what you want to do with the modified XML content X'?
I use Apache Cocoon Framework for my web application project, so I have a specific pipeline in my sitemap, which is calling an action in order to find where are the modifications and then take the X file, act xslt transformations and serialize it as HTML.
<map:pipeline id="law-updated">
<map:match pattern="pd/*/updated">
<map:act type="findmodifications">
</map:act>
<map:generate src="{1}.xml" type="file"/>
<map:transform src="legislation_updated.xslt" type="xslt"/>
<map:serialize type="xhtml"/>
</map:match>
</map:pipeline>
My XSLT template for HTML transformations is here:
<xsl:template match="/">
<html>
<head>
</head>
<body>
<div id="wrapper">
<div id="header">
............
</div>
<div id="content">
<div id="content_column">
<div class="button" >
<a>
<xsl:attribute name="href">
<xsl:value-of select="Legislation/Metadata/dc:identifier"/>/data.rdf
</xsl:attribute>RDF</a>
</div><br/><br/>
<div class="button" >
<a style="color: #fff;">
<xsl:attribute name="href">
<xsl:value-of select="Legislation/Metadata/dc:identifier"/>/data.pdf
</xsl:attribute>PDF</a>
</div><br/>
</div>
<div id="content_body">
<div id="content_text">
<div id="content_bar">
<ul>
<li style="font-size: 16px; font-weight: bold; float:left; padding-right:2em;">
<a><xsl:attribute name="href">
<xsl:value-of select="Legislation/Metadata/dc:identifier"/>/contents
</xsl:attribute>Περιεχόμενα</a>
</li>
<li style="font-size: 16px; font-weight: bold; float:left; padding-right:2em;">
<a><xsl:attribute name="href">
<xsl:value-of select="Legislation/Metadata/dc:identifier"/>
</xsl:attribute>Κείμενο</a>
</li>
<li style="font-size: 16px; font-weight: bold; float:left; padding-right:2em;">
<a><xsl:attribute name="href">
<xsl:value-of select="Legislation/Metadata/dc:identifier"/>/timeline
</xsl:attribute>Χρονολόγιο</a>
</li>
<li style="font-size: 16px; font-weight: bold; float:left; padding-right:2em;">
<a><xsl:attribute name="href">
<xsl:value-of select="Legislation/Metadata/dc:identifier"/>/citations
</xsl:attribute>Παραπομπές</a>
</li>
</ul>
</div>
<br/>
<br/>
<table border="0">
<tr><td>ΦΕΚ: </td>
<td><xsl:value-of select="Legislation/Metadata/diavgeia:fek/issue"/>
/ <xsl:value-of select="Legislation/Metadata/diavgeia:fek/year"/>
/ <xsl:value-of select="Legislation/Metadata/diavgeia:fek/fekNumber"/>
</td></tr>
<tr>
<td>ΚΩΔΙΚΟΣ ΑΠΟΦΑΣΗΣ: </td>
<td> <xsl:value-of select="Legislation/Metadata/diavgeia:decisionType/diavgeia:label"/>
  <xsl:value-of select="Legislation/Metadata/Year"/>
/ <xsl:value-of select="Legislation/Metadata/Number"/>
</td>
</tr>
<tr>
<td>ΗΜΕΡΟΜΗΝΙΑ ΕΚΔΟΣΗΣ: </td>
<td>
<xsl:value-of select="Legislation/Metadata/dc:created"/>
</td>
</tr>
<tr>
<td>ΥΠΟΓΡΑΦΗ: </td>
<td>
<xsl:for-each select="Legislation/Metadata/diavgeia:signer">
<a><xsl:attribute name="href">http://localhost:8888/GRLegislation/signer/<xsl:value-of select="@uid"/></xsl:attribute>
<xsl:value-of select="diavgeia:firstName"/> 
<xsl:value-of select="diavgeia:lastName"/>
</a>
<xsl:choose>
<xsl:when test="position() != last()">, </xsl:when>
</xsl:choose>
</xsl:for-each>
</td>
</tr>
<tr>
<td>ΣΧΕΤΙΚΑ ΜΕ: </td>
<td>
<xsl:for-each select="Legislation/Metadata/diavgeia:tag">
<xsl:value-of select="diavgeia:label"/>
<xsl:choose>
<xsl:when test="position() != last()">, </xsl:when>
</xsl:choose>
</xsl:for-each>
</td>
</tr>
</table>
<br/>
<h4>
<xsl:value-of select="Legislation/Metadata/dc:title"/>
</h4>
<br/>
<xsl:for-each select="Legislation/Body/Article">
<div><xsl:attribute name="id"><xsl:value-of select="@id"/></xsl:attribute>
<p>
<h5>Άρθρο
<xsl:value-of select="Number"/>
</h5>
<xsl:if test="Title">
<h6>
<xsl:value-of select="Title"/>
</h6>
</xsl:if>
<br/>
<ol>
<xsl:for-each select="P">
<div><xsl:attribute name="id">
<xsl:value-of select="@DocumentURI"/>
</xsl:attribute>
<li>
<xsl:for-each select="P2">
<xsl:value-of select="Text"/> 
</xsl:for-each>
<xsl:for-each select="List">
<ol style="list-style-type:lower-greek">
<xsl:for-each select="Case">
<li>
<xsl:value-of select="Text"/>
</li>
</xsl:for-each>
</ol>
</xsl:for-each>
<xsl:for-each select="Modification">
<div id="modification" >
<xsl:if test="P">
<ol>
<xsl:for-each select="P">
<li>
<xsl:attribute name="value">
<xsl:value-of select="Number"/>
</xsl:attribute>
<xsl:for-each select="P2">
<xsl:value-of select="Text"/> 
</xsl:for-each>
<xsl:for-each select="List">
<ol style="list-style-type:lower-greek">
<xsl:for-each select="Case">
<li>
<xsl:value-of select="Text"/>
</li>
</xsl:for-each>
</ol>
</xsl:for-each>
</li>
</xsl:for-each>
</ol>
</xsl:if>
<xsl:if test="P2">
<xsl:for-each select="P2">
<xsl:value-of select="Text"/> 
</xsl:for-each>
</xsl:if>
<xsl:if test="Case">
<ol>
<xsl:for-each select="Case">
<li><xsl:attribute name="value">
<xsl:value-of select="Value"/>
</xsl:attribute>
<xsl:value-of select="Text"/>
</li>
</xsl:for-each>
</ol>
</xsl:if>
</div>
</xsl:for-each>
</li>
</div>
</xsl:for-each>
</ol>
</p>
</div>
</xsl:for-each>
</div>
</div>
</div>
</body>
</html>
</xsl:template>
In case you need extra information please ask. A real XML X file is here. A real XML Y file, which has modification for X, is here. The modified XML will be like this here Thanks in advance!
MODIFICATION TYPES:
- Replacement of a node, like modifications 2,3,4 of real XML file Y.
- Addition of a node, like modification 1 of real XML file Z.
- Deletion of a node. Let's say the modification for deletion will have the structure of an empty node. Like
<Modification DocumentURI=""><P2 DocumentURI=""></P2></Modification>
